Unsteady hydrodynamic interaction between two cylindroids in shallow water based on high-order panel method

Xu, Huafu; Zou, Zao-Jian; Zou, Lu; Liu, Xiaoyan

doi:10.1016/j.enganabound.2016.06.006

Cited by 12 publications

(18 citation statements)

References 8 publications

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“…In the previous studies on the ship-to-ship interaction problem by using the potential flow method, the rigid wall condition was applied on the free-surface as / = 0 (Xu et al, 2016;Yeung, 1978;Zhou et al, 2012). Since the speed U is not included in the free-surface boundary condition, the speed of the two vessels can be arbitrary.…”

Section: The Boundary Value Problemmentioning

confidence: 99%

“…To improve the accuracy of prediction, the 3D potential flow method has been widely used nowadays. From the published results and validations (Xu et al, 2016;Yao and Zou, 2010;Yuan et al, 2015;Zhou et al, , it has been found that the 3D potential flow solver can generally provide a satisfactory estimation. However, the publications using 3D potential flow method to investigate the confined water problem are still very limited.…”

Section: Introductionmentioning

confidence: 95%

“…The complexity of the free-surface condition is one of the reason which prevents it from being widely used, especially when it refers to the unsteady flow involved in ship-lock and ship-ship interactions. In most of the works on the 3D potential flow method, the free-surface is treated as a rigid wall (Xu et al, 2016;Zhou et al, 2012). This assumption is only reasonable when the speed of the vessel is very small.…”

Section: Introductionmentioning

confidence: 99%

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Ship Hydrodynamics in Confined Waterways

Yuan

2019

Journal of Ship Research

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The hydrodynamic performance of a vessel is highly dependent on its manoeuvring waterways. The existence of the banks and bottom, as well as the presence of the other vessels, could have a significant influence on a ship's hydrodynamic behaviour. In confined waterways, many researchers suspect the applicability of the classical potential flow method due to its nonviscous and irrotational assumption. The main objective of the present paper is to improve and develop the boundary value problem (BVP) of a potential flow method and validate its feasibility in predicting the hydrodynamic behaviour of ships advancing in confined waterways. The methodology used in the present paper is a 3D boundary element method (BEM) based on a Rankine type Green function. The numerical simulations are performed by using the in-house developed multi-body hydrodynamic interaction programme MHydro. The waves and forces (or moments) are calculated when ships are manoeuvring in shallow and narrow channels, when ships are entering locks, or when two ships are encountering or passing each other. These calculations are compared with the benchmark test data published in MASHCON (Lataire et al., 2009; Vantorre et al., 2012), as well as the published CFD (Computational Fluid Dynamics) results. It has been found that the free-surface elevation, lateral force and roll moment can be well predicted in ship-bank and ship-bottom problems. However, the potential flow solver fails to predict the sign of the yaw moment due to the cross-flow effect. When a ship is entering a lock, the return flow effect has to be considered. By adding a proper return flow velocity to the boundary value problem, the modified potential flow solver could predict the resistance and lateral forces very well. However, it fails to predict the yaw moment due to the flow separation at the lock entrance. The potential flow method is very reliable in predicting the ship-ship problem. The resistance and lateral force, as well as the yaw moment, can be predicted well by using the potential flow method.

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Section: The Boundary Value Problemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Ship Hydrodynamics in Confined Waterways

Yuan

2019

Journal of Ship Research

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“…Compared with the studies of slow-speed ship-to-ship interactions [7,57,58] in which the freesurface effect is ignored, above observations of moderate-speed overtaking indicate a strong influence from the deformed free surface. In particular, wave-making of the moving hulls and the interference of ship waves are discovered to be the two major aspects of the free-surface effect, which substantially affect the loads on each hull in the overtaking process.…”

Section: (D) Analysis Of the Free-surface Effectmentioning

confidence: 56%

Experimental and numerical study of ship-to-ship interactions in overtaking manoeuvres

Yu¹,

Wang²,

Yeung³

2019

Proc. R. Soc. A.

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The study on close-quarter manoeuvring of vessels is of great importance for the safety and efficiency of maritime operations. In this paper, the hydrodynamic interactions between two vessels in moderate-speed overtaking manoeuvres are studied. Computational investigation by free-surface panel method is performed, and the results are assessed against experimental measurements from towing-tank model tests. The influences of overtaking speed and the speed difference between vessels on the hydrodynamic loads are studied. It is found that the free-surface deformation, on account of the blockage effects of the bodies, wave-making properties of the vessels, and the interference of unsteady wave patterns between the vessels, considerably affects the hydrodynamic interactions. In addition, it is also discovered that the influence from the unsteady heave and pitch motions of the hulls on the hydrodynamic loads can be non-negligible. Furthermore, it is found that the slower vessel to be overtaken generally experiences larger loads with more variation than the overtaking vessel. The loads on both vessels become more similar to those of a steady-state di-hull system when the speed difference between vessels is small.

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“…They showed that the flow speed is an important factor relating to the hydrodynamic interaction. Xu et al [18] used high-order element method to predict hydrodynamic interaction of two cylindroids moving along parallel courses in shallow water. Since free surface elevation was neglected in their work, only low forward speed problem was addressed.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the unsteady hydrodynamic loads of ship passing by bridge piers by a 3-D boundary element method

Yuan

et al. 2018

Engineering Analysis with Boundary Elements

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A 3-D Rankine type Green function boundary element method is developed to estimate the unsteady hydrodynamic interaction during ship passing piers process. To address this moving boundary problem, a free surface re-meshing algorithm based on the combination of local mesh and global mesh is proposed to update fluid boundary and the boundary value formula is solved at each time step. Two alternative numerical models for ship passing piers problem are compared with the current analysis method. Based on the three numerical models, the characteristics of the hydrodynamic loads acting on the passing ship are specified and the critical positions for the peak values have been identified. Simulation results demonstrate that the fluid disturbance induced by the piers is of importance. Therefore, the study of ship-piers hydrodynamic interaction in a river must be handled as a different forward speeds problem. Additionally, the wave elevation effect can only be neglected on condition that the forward speed is very low.

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Unsteady hydrodynamic interaction between two cylindroids in shallow water based on high-order panel method

Cited by 12 publications

References 8 publications

Ship Hydrodynamics in Confined Waterways

Ship Hydrodynamics in Confined Waterways

Experimental and numerical study of ship-to-ship interactions in overtaking manoeuvres

Investigation on the unsteady hydrodynamic loads of ship passing by bridge piers by a 3-D boundary element method

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